GEEK:: TrackMate OpenSource Object recognition & tagging http://trackmate.sourceforge.net

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Trackmate is an open source initiative to create an inexpensive, do-it-yourself tangible tracking system, allowing any computer to recognize tagged objects (and their corresponding position, rotation, and color information) when placed on a surface. Trackmate sends all object data via LusidOSC, a protocol layer for unique spatial input devices which enables any LusidOSC-based application to work with the system.

[youtube http://www.youtube.com/watch?v=Eiu6CQdQ8UU?wmode=transparent]